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阿尔泰山南缘中泥盆统苦橄岩低钙橄榄石的成因探讨被引量:7
2008年
阿尔泰山南缘中泥盆统北塔山组地层发育世界罕见的总厚度达百米的苦橄质熔岩。苦橄岩的斑晶主要为蛇纹石化的自形一半自形橄榄石。对橄榄石斑晶的电子探针分析结果表明,其成分相当均匀,其Fo含量为79-8%~81-8%,并且具有异常低的CaO含量(0~0.06%),明显比典型岛弧苦橄岩中橄榄石的Fo含量和CaO含量要低的多。根据前人对Ca在橄榄石-硅酸盐熔体中的行为实验成果推测,这种橄榄石可能是高硅、低铁、低碱的玄武质岩浆结晶形成的。
张招崇蔡劲宏闫升好陈柏林周刚何立新
关键词:苦橄岩岛弧阿尔泰山南缘
阿尔泰南缘中泥盆统北塔山组火山岩的矿物学研究被引量:3
2012年
阿尔泰山南缘中泥盆统北塔山组火山岩极为发育。本文对富辉橄玄岩和玄武岩中的单斜辉石和橄榄石斑晶进行了矿物化学分析,并结合矿物的地质温压计和岩浆结晶模拟,约束了两种岩石中矿物的形成过程,推测了原始岩浆的演化过程。提出富辉橄玄岩和玄武岩的原始岩浆属于拉斑玄武系列,富辉橄玄岩中的高压单斜辉石来源于深部(40~50 km),其结晶早于橄榄石;玄武岩中单斜辉石大多属于岩浆房结晶产物(30~40km),其结晶晚于橄榄石;两种岩石中橄榄石均属于岩浆房结晶产物(30~40 km)。
张贺张招崇
关键词:橄榄石单斜辉石矿物学
Geochronology and Geochemistry of the Radiolarian Cherts of the Mada'er Area,Southwestern Tianshan:Implications for Depositional Environment被引量:8
2011年
In the southwestern Tianshan,the geologic ages of many strata and their depositional environments are still poorly constrained because of complex structures.The Mada'er area is located in the Kuokesaleling belt,Southwestern Tianshan.The cherts from the former Wupata'erkan Group contain abundant radiolarian fossils,including 10 species which are identified as late Devonian to early Carboniferous in age.Eleven chert samples have SiO_2 contents ranging from 88.80 wt%to 93.28 wt%, and 2.02 wt%to 3.72 wt%for Al_2O_3.The SiO_2/Al_2O_3 ratios of all samples vary from 23.84 to 46.11, much lower than those of the pure cherts(80-1400).These values suggest that the cherts contain high ratios of terrigenous materials.The Al_2O_3/(Al_2O_3+Fe_2O_3)ratios vary between 0.64 and 0.77,whereas V and Cu concentrations range from 10.92 ppm to 26.7 ppm and from 2.15 ppm to 34.1 ppm respectively. The Ti/V ratios vary from 25.53 to 44.93.The total REE concentrations of the cherts are between 30.78 ppm and 59.26 ppm,averaging 45.46 ppm.The(La/Ce)_N ratios range from 0.81 to 1.12,and 0.88-1.33 for(La/Yb)_N,averaging 1.09,which suggests a continental margin environment.Consequently,it is inferred that the cherts formed in a residual sea environment during the late Devonian to early Carboniferous time,which suggests that the collision between the Karakum-Tarim and Kazakhstan-Junggar plates did not occur at the time.In addition,the regional geological information indicates that the study area experienced a post-collision stage during the early Permian,and thus it is likely that the collision between the two plates took place in the late Carboniferous.
KANG JianliZHANG ZhaochongZHANG DongyangHUANG HeDONG ShuyunZHANG Su
关键词:GEOCHEMISTRY
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